使用自定义回调处理器将提供更好的特性，并提供从客户端会话上下文动态传递用户名和密码的功能。

Using the custom call back handler will provide better features and the ability to pass the username and password dynamically from the client's session context.

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你可能还有两个客户端校验来确保用户名和密码不要少于一位字符或太长，或者不包含任何无效字符。

You might also have two client-side validators that ensure that the username and password are at least a character or so long, or perhaps don't contain any invalid characters.

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用于客户端计算机的最后访问的用户名。

The user name used for the last access from the client computer.

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